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Biotransfer of selected risk metals into plants and their accumulation and distribution in plant organs
Le Minh, Phuong ; Lachman, Jaromír (advisor)
Contamination of soils with heavy metals is one of the serious environmental problems threatening human being. Heavy metals are considered as the special hazard of soil pollutants because of the adverse effects on the plant growth, the amount, activity of useful microorganisms in soils and the quality of food. Regard to the persistent and toxicity, the heavy metals are toxic when we consider different kinds of pollutants in soils. In the soil, zinc (Zn), cadmium (Cd), lead (Pb) and mercury (Hg) toxicities frequently occur than the other metals because of their precipitation and sorption by the soil. It is a very dangerous situation because when these metals are taken up by plants, they can be transported to the food web and food chains.
In the present study, the accumulation of four heavy metals (mercury, zinc, lead and cadmium) in the whole grain of spring accessions of emmer, einkorn and common spring wheat cultivars and potato (Solanum tuberosum) is reported. Heavy and essential elements were monitored in potato cultivars in the exact field experiments and in hydroponically grown plants. The elements were determined by methods FAAS, ET AAS, and AMA (Advance Mercury Analysis). Statistical analyses were performed using SPSS 9.0 with the Tukey HSD (Honestly Significant Difference) test (alpha equal to 0.05).
In our study, the concentration of heavy metals decreased in the order zinc (Zn) > lead (Pb) > cadmium (Cd) > mercury (Hg) in the wheat grain. The comparison between three varieties of investigated wheat revealed that the emmer wheat was rich in zinc content (62.12 mg kg-1 dry matter), while the spring wheat had the lowest average concentration of zinc in the grain (40.99 mg kg-1 dry matter). Generally, the values of lead concentration in grain wheat varieties were low (ranging from 0.1268 mg kg-1 dry matter to 0.2950 mg kg-1 dry matter).
The concentrations of mercury in four typical growth stages of wheat (boot stage 10, heading stage 10.2 1/4 of head emerged, leaf-stage 10.2 and stage ripening 11 according to Feekes) were also determined. It has been shown that the concentrations of mercury in different wheat varieties were absorbed differently at different growth stages of plant. Stage 10.2 and leaf stage 10.2 showed the high mercury content (0.0152 mg kg-1 dry matter and 0.0214 mg kg-1 dry matter, respectively). Among individual varieties significant differences were determined.
Amounts of toxic and potentially toxic elements detected in investigated potato tubers are characterized by a large variability within investigated groups. Performing statistical analysis (one way ANOVA) showed that there were no significant differences between two investigated groups of samples (samples from Uhříněves and Valečov in the year 2013 and 2014) considering either one of investigated metals. Measurable levels of mercury were found in smallest amounts in all investigated potato samples comparing to other metals (Cd, Pb).
Plant cells compared to animal cells are characterized by the formation of cell walls. Plasma membrane or cell membrane is a biological active membrane separating the interior of cell from the outside environment. An adjusted method for isolation of protoplasts was developed and adapted for isolation of protoplasts from plant material (potatoes). In our experiment, the plants were grown hydroponically in the Research Institute of Plant Crops Prague-Ruzyně. If we examine the plant membrane, one option is to remove the cell wall by means of special mixture enzymes. Protoplasts were released in the dark at 25 degrees of Celsius for 18 hours. The 70 and 90 microns sieve was used to filter and then centrifugation for 5 minutes at 100 x g. All the steps were carefully carried out to prevent the damage or breakage of protoplasts.
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Comparison of landscape structure changes in the Czech and Slovac Republic after 1990
Kovalčík, Lukáš ; Romportl, Dušan (advisor) ; Lipský, Zdeněk (referee)
Downfall of communist regime from 1989 brought fundamental changes to the political, social and economic system in post-socialist countries and influenced changes in landscape and its structure. The objective of this thesis was comparison of landscape structure changes in Czech Republic and Slovakia after 1990 by means of chosen spatial indices and identify key processes leading to changes of land cover. CORINE Land Cover database was used to derive landscape changes in the period 1990-2000 in Czech republic and Slovakia. According to analysis, suburbanisation, extensification and intensification of agriculture as well as afforestation have been recognised as the most important processes in the study areas. Results demonstrated significant diferences in intensity of individual processes and their impact on landscape heterogeneity in both countries. In Slovakia, the most intense changes have been made by the processes of afforestation in mountain and submontane areas in the central and north part of the country. This led mostly to increase in landscape heterogeneity. Oppositely, the most intense processes of extensification of agriculture in border areas of Czech Republic led mainly to spatial homogenization of landscape. Thus, results refer to various socioeconomic and natural factors which...
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Application of mathematical models for simulation of hydrological conditions in selected streams
Kurková, Marie ; Vašků, Zdeněk (advisor) ; Michal, Michal (referee)
Flood is a natural phenomenon that occurs at different intensities and irregular time intervals. As to natural disasters, floods represent the greatest direct threat for the Czech Republic. They may cause serious critical situations during which not only extensive material damages are done, but may bring also losses of the lives of inhabitants in affected areas as well as vast devastation of cultural landscape including environmental damages. Important from the viewpoint of the elimination of potential threats and consequences of such events is the information issued by flood forecasting service about the character and size of flood areas for individual N-year flood discharges and specific flood scenarios. An adequate image of depths and flow rates in the longitudinal or cross profile of the watercourse during a flood event is provided by the hydrodynamic model. This is why the information obtained from the hydrodynamic models occupies a privileged position from the viewpoint of the protection of citizens' lives and mitigation of damage to their property. The first study is situated on the river Úhlava in meadows by Příchovice near the town Přeštice. The proposal of flood-protection measures is contained in Territorial control documentation. The documentation was elaborated on the basis of hydraulic calculations and experiences from the flood in August 2002. The mathematical model is practically used in the study of analysis of proposed flood-protection measures. The analysis is based on mathematical simulation of water outflow and water level on the river Úhlava. It is possible to use the non-commercial software Hec-Ras, version 3.1.1., for the simulation itself. One of the points of view of the possibility of using proposed flood-protection measures is total efficiency. The mathematical model is posssible to use as a basis of support for realization of proposed flood-protection measures on the river Úhlava in meadows by Příchovice within the grant programme "Program prevence před povodněmi II" under the control of the Ministry of Agriculture. In the second case the mathematical model is practically used in the study of hydrotechnical analysis of streams in cadastral unit. The analysis is based on matjematical simulation of water outflow and water level on chosen streams. It is possible to use the noncomercial software HEC-RAS for the own simulation. The analysis should be shown on dangerous places in the interest place. The mathematical model is possible of using to use as basis for revaluation of action in spatial plan or for view of the flood-protection measures in the village Mochtín. Basic input into the hydrodynamic models is represented by altimetry data. One of ways to obtain such data is through the method of aerial laser scanning (ALS) from the digital relief model (DRM). This method is considered one of the most accurate methods for obtaining altimetry data. Its bottleneck is however incapacity of recording terrain geometry under water surface due to the fact that laser beam is absorbed by water mass. The absence of geometric data on watercourse discharge area may perceptibly affect results of modelling, especially if a missing part of the channel represents a significant discharge area with its capacity. One of methods for eliminating the deficiency is a sufficient channel recess by means of software tools such as CroSolver. The third submitted paper deals with the construction of a hydrodynamic model using 5th generation DRM data, and compares outputs from this model at various discharges with a model based on the altimetry data modified by using the CroSolver tool. Outputs from the two hydrodynamic models are compared in HEC-RAS programme with the use of recessed data and with the use of unmodified DRM. The comparison is done on the sections of two watercourses with different terrain morphology and watercourse size. A complementary output is the comparison of inundation areas issuing from both model variants. Our results indicate that differences in the outputs are significant namely in the lower discharges (Q1, Q5) whereas for Q50 and Q100 the difference is negligible with a great role being played by morphology of the modelled area and by the watercourse size.
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The comparison of digital terrain model sources in GIS for hydrological purposes
Klempíř, Hynek ; Bašta, Petr (advisor) ; Gdulová, Kateřina (referee)
This thesis deals with comparsion of digital terrain models from different
sources processed in GIS for hydrological purposes. The diploma thesis is
composed from several parts. First part sis consist of characteristics related to
watershed and water flow, which are important for the understanding this work. The
thesis also describes digitial terrain model, his creation and methods for obtainig
digitial models. Then, there are described data sources from which is possible to
gain digitial models. Next chapter is dedicated to the coordinate system. The last
parts of this thesis describes drain alghorithms.
Characteristic of this area was collected on experimental watershed Modrava II
with the ESRI ArcGIS Desktop software that would mainly Spatial Analyst and
ArcHydro extensions.
The results of this diploma thesis can be concluded that the free digital terrain
model SRTM 90 is not suitable for small regions with diverse terrain structure. Thereason is a small resolution model. Other terrain models provided free of chargé are
sufficient even for small areas as the selected area of interest. Paid digitial models
can al lbe established for the area of interest as appropriate.
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Economic Development of Kazakhstan since 1991
Dochshanova, Aida ; Procházka, Petr (advisor) ; Rychkova, Victoria (referee)
The paper deals with the strategic planning of economic development of Kazakhstan. The aim of the work is to provide analyses and material on future and present of Kazakhstans economy. It is written in detail about main characteristics of economic development of the Republic of Kazakhstan. The text gives valuable information about formation and development of Kazakhstans economic relations with other countries. The fact that there is the necessity to develop alternative forms of ownership and more rational use of recourses, scientific and technical potential is stressed.The second chapter gives a detailed analysis of strategy of economic development.Long-term priorities and tasks of strategy of economic growth and development are discussed. It is shown that strategy of development of the country Kazakhstan 2030 is the most important reference point of the real and perspective development of socio- economic system. The perspectives of Kazakhstans strategy in comparison with world analogs are also analyzed in paper.
It is reported that in general it is possible to tell that theoretical summarizing of national and international experience and a concrete condition of reforming of society allows solving tasks of coordination of strategic aims and tactical actions within national model of development in a transformation period.
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Current situation regarding the sources and intake of selenium in European population
Půtová, Lucie ; Čadková, Zuzana (advisor) ; Křivská, Daniela (referee)
This bachelor thesis is focused on the current dietary recommendations and the actual intake of selenium from food for the European inhabitants, divided into 6 appropriate regions. Above all, the thesis deals with the issue of the sources of this element and possible ways of its supplementation. Part of this thesis is also the identification of areas in which there is a risk of low intake of selenium, and at the same time there the reasons for this deficit are adressed.
In the introduction selenium is characterized as a trace biogenic element that has physical and chemical properties, which affect the organism of each individual. Selenium can have a wide range of positive effects, but at the same time, of course, its toxicity needs to be taken into account. For this reason, in this study space was devoted to diseases that selenium may cause in cases of non-compliance with the recommended amount of intake.
The amount of the intake of selenium depends mainly on its content in the soil. The concentration of selenium differs according to the geographical conditions of individual regions, which are described in the main part of this thesis. Each region contains a different amount of selenium in soil and consequently in animal and plant products. According to my knowledge from the study of literature, another very important factors is the availability of certain foods, such as fish, which are rich in selenium and thus greatly increase concentration of selenium in the daily diet for several states. The focus was also given to countries, that don't have food rich in selenium, and thus, continue to seek the best possible form of supplementation.
This thesis shows the total comparison of the daily intake of selenium in the specific states of Europe. The results have shown that the most stable intake of this element occurs on the territory of the South Europe. They are mainly coastal states and there is a very good availability of fish products mentioned before. By contrast, in south-eastern Europe it is evident that due to the low financial possibilities the problem of selenium deficit is not dealt with and it is assumed that there may occurr a decline in intake of this element in the diet.
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Long-term changes of forest vegetation - the comparison of present species composition and biodiversity with the historical records
Vojík, Martin ; Boublík, Karel (advisor) ; Douda, Jan (referee)
The thesis presents the results of the research of the long term changes in semi-natural vegetation of lowland woodlands in the forest district Klínec (phytogeographical district Střední Povltaví, Central Bohemia, Czech Republic), which is located between the northeastern part of the Brdy Highlands (Hřebeny) and the Vltava River valley. Research of the long term changes over the past nearly 60 years was conducted by resampling vegetation on semi-permanent plots. Old relevés by V. Samek (1957), which were provided by the Czech National Phytosociological database, were used as reference data. Twenty-nine relevés were resampled, which were located using old data and GIS. The shift to shady plant communities (loss of heliophilous and expansion of shade-tolerant species) was found in the study area caused by higher canopy of tree and shrub layer due to the expansion of deciduous trees. Species richness (alpha diversity) was significantly declined. Homogenization of the vegetation was not significantly demonstrated in study area. Species of nutrient-rich habitats as well as alien and invasive species were expanded and fewer red list species of vascular plants was found. Vegetation change in the area was probably most affected by the change in forest management in lowland woodlands (decline of coppicing), eutrophication (deposition of nitrogen from the atmosphere, runoff from agricultural land) and the effect of forest animals especially wild boars.
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Comparison of student bank accounts in the CR
Kuklišová, Michaela ; Steininger, Michal (advisor) ; Ondřej, Ondřej (referee)
This work is focused on student bank accounts which are determinate for students
of secondary schools and universities. The theoretical part focuses on the history of money and the bank system in the Czech Republic, followed by information about Czech National bank, past and present, commercial banks, their specifications, history and interesting facts. The following are specified account services, such as account and student account.
In the practical part was used a questionnaire established criteria that have an impact
on the selection of banking product, which banks are the most frequent, student satisfaction with the bank or the purpose of having a student account. In another part of practical research there are specifications and comparison of the student bank account and compared to each other. To select the most suitable student account was considered a model student, who was identified on the basis of the questionnaire. From final comparison of student accounts are generated two best student accounts, account Fresh from Česká spořitelna and account G2.2 from Komerční banka. The final choice depends on the specific preferences of the client.
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Basic comparison winter wheat and neighboring flowering strip
Suchý, Viktor ; Kazda, Jan (advisor) ; Josef, Josef (referee)
Summary
The winter wheat belongs to the staple crop not only around the whole world, but also in the Czech Republic, where it has been grown on about 38 percent of the cultivated land and, regarding the general share of cereals, on 60 percent of the cultivated land. Since the cereals do not provide nectar, nor are they the valuable source of pollen, as regards to the diversity of insects the cereals provide rather poor environment. The lack of food resources for the living species of insects in the agricultural landscape influenced by the high ratio of cereals should be compensated by flowering strips. Regardless of the potential of the flowering strips to support the biodiversity of insects in landscapes, the flowering strips could boost useful species of insects in surrounding plants and help with pest control.
In 2014 the research experiment on a flowering nectar-rich biostrip supposedly improving the presence of pollinators as well as natural enemies was done on the field of the research station in Uhrineves, Prague. In autumn 2014 the winter wheat was sowed and then in spring 2015 the flowering strips consisting of 12 plant species were sowed along one side of the winter wheat field. The observations of the insect species presence were always conducted during favourable climatic conditions from the beginning of June until the harvest of winter wheat in late July. Insect captures were conducted using Moericke traps method once or twice a week and sweep-netting method once every two weeks. The number of insects species such as predators (Coccinellidae, Cantharidae, Staphylinidae), parasitoids (Hymenoptera parasitica) and pollinators (Syrphidae) were observed. Simultaneously, the intensity of flowering including species of weeds was assessed. The open flowers were counted on four unchanged spots on the field, the area of 1 square metre. MS Excel was used for data processing.
The hypothesis of the project has been confirmed. Using the sweepnetting methods, the higher number of monitored insect species has been found in the flowering strips compared to the wheat vegetation. Significantly higher number of parasitic wasps specimens has been observed. The sweepnetting method is considered as an appropriate in comparison to Moericke traps, which have been luring the insects in the vicinity, but have not proved the real presence of insects in the cover.
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Financial Analysis of chosen Company
Schmiedová, Renata ; Slaboch, Josef (advisor) ; Malý, Michal (referee)
The submitted bachelor's work with the topic Financial Analysis of the Chosen Company deals with the ananlysis of financial health of DACHDECKER spol. s r.o. during the period of 2011 to 2014 with the aim to evaluate the course of financial analysis indicators and to submit the suggestion that can lead to present condition improving.
The work is divided into two crucial parts. The theoretical part is an introduction to the base that can be used for financial analysis treatment, with various types of financial analysis attitudes, with methods that can be applied, and, last but not least as well as with the users who could be interested in the results of anylysis carried out.
In practical part, the accounting data have been analysed via absolute indicators methods using the horizontal and vertical analysis. A substantial part are the results
of aliquot indicators of rentability, activity, liquidity and indebtedness, including
its interpretation. A calculation of a bankruptcy model is a part of this work as well.
In the course of practical part, the chosen indicators are applied to a competitive firm
that is doing business in the same branch as DACHDECKER spol. s r.o., so that a branch comparison could be carried out and thus the information ability of the data could be more precise.
In the conclusion, attention is paid to evaluating the gained results, assessing
the possible causes of present condition and putting forward a recommendation in future.
Financial analysis was applied to accounting data in the period of 2011 to 2014.
A considerable takings decline in 2012 can be seen in the analysis carried out. This decline did not get deeper in the following years , which is a positive fact. However, the situation with the takings development was considerably reflected in the total results of the economic activities, and the firm´s ability to appraise the invested capital was radically limited. Moreover, in 2013 the firm suffered a loss. Because a comparison was done with a competitive firm, it can be stated that other firms of the same branch suffered
a considerable decline in 2013 as well. Should we view the firm DACHDECKER
spol. s r. o. from the point of ability to keep its liability then this firm can be considered
to be financially healthy and credible.
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